如何制止“强制关闭”的错误

问题描述：

荫让步的EditText一些值，但如果我尝试使用backspack按钮将其删除，并进入新的value..It越来越ForceClosed.How来纠正这个问题如何制止“强制关闭”的错误

我的代码如下

empty_cyl_recvd = (EditText) findViewById(R.id.empty_cyl_recvd); 
new_cyl_recvd = (EditText) findViewById(R.id.new_cyl_recvd); 
filled_cyl_unload = (EditText) findViewById(R.id.filled_cyl_unload);`enter code here` 
    dmg_cyl_recvd = (EditText) findViewById(R.id.dmg_cyl_recvd);  

    total_dmg_cyl=(EditText)findViewById(R.id.sdff); 
    total_empty_cyl=(EditText)findViewById(R.id.wertyu);  
    total_filled_cyl=(EditText)findViewById(R.id.gfhgftg); 

empty_cyl_recvd.addTextChangedListener(new TextWatcher() 
     { 

      @Override 
      public void afterTextChanged(Editable arg0) { 
       // TODO Auto-generated method stub 

      } 

      @Override 
      public void beforeTextChanged(CharSequence arg0, int arg1, 
        int arg2, int arg3) { 
       // TODO Auto-generated method stub 

      } 

      @Override 
      public void onTextChanged(CharSequence arg0, int arg1, int arg2, 
        int arg3) { 

    int a=Integer.parseInt(empty_cyl_recvd.getText().toString());    int b=Integer.parseInt(Util.EMPTY_LIST.get(0).toString()); 
       int c=a+b; 
       total_empty_cyl.setText(""+c); 


          }}); 

     filled_cyl_unload.addTextChangedListener(new TextWatcher() 
     { 

      @Override 
      public void afterTextChanged(Editable s) { 
       // TODO Auto-generated method stub 

      } 

      @Override 
      public void beforeTextChanged(CharSequence s, int start, int count, 
        int after) { 
       // TODO Auto-generated method stub 

      } 

      @Override 
      public void onTextChanged(CharSequence s, int start, int before, 
        int count) { 

       int a=Integer.parseInt(filled_cyl_unload.getText().toString()); 
       int b=Integer.parseInt(Util.FILL_LIST.get(0).toString()); 
       int c=a+b; 
       total_filled_cyl.setText(""+c); 


     }); 


     dmg_cyl_recvd.addTextChangedListener(new TextWatcher(){ 

      @Override 
      public void afterTextChanged(Editable s) { 
       // TODO Auto-generated method stub 

      } 

      @Override 
      public void beforeTextChanged(CharSequence s, int start, int count, 
        int after) { 
       // TODO Auto-generated method stub 

      } 

      @Override 
      public void onTextChanged(CharSequence s, int start, int before, 
        int count) { 

       int a=Integer.parseInt(dmg_cyl_recvd.getText().toString()); 
       int b=Integer.parseInt(Util.DAMAGE_LIST.get(0).toString()); 
       int c=a+b; 
           total_dmg_cyl.setText(""+c); 


     });``

在解析为onTextChanged中的整数之前，为所有EditText添加空检查。 –

你想达到什么目的？想过滤一些东西？ –

停止强制关闭放在try {} catch（）{}块内的TextChanged（）代码。 –

答

首先我建议你使用调试器，这将帮助你快速捕捉这些问题。

在onTextChange的代码中可能存在异常（NPE/NumberFormat/ArrayIndexOutOfBounds）。因此，要适当检查此代码

int a,b; 
if(dmg_cyl_recvd.getText() != null && !dmg_cyl_recvd.getText().trim().equals("")) // also put it in try-catch for the case the input is not numeric 
try{ 
    a=Integer.parseInt(dmg_cyl_recvd.getText().toString()); 
}catch(NumberFormatException ex){ 
//alert user about wrong input 
} 
if(Util.DAMAGE_LIST.size() > 0)//assuming it is a list, if not use method that gives the size of corresponding collection 
    b=Integer.parseInt(Util.DAMAGE_LIST.get(0).toString());

答

添加适当的异常处理以避免强制关闭。当Integer.parseInt（..）获取空/无效文本时，您可能会遇到NumberFormatException。

如何制止“强制关闭”的错误

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